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Huge, Millicoulomb Charge Storage in Ceramic Hydroxyapatite by Bimodal Electric Polarization
Author(s) -
Ueshima M.,
Nakamura S.,
Yamashita K.
Publication year - 2002
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/1521-4095(20020418)14:8<591::aid-adma591>3.0.co;2-7
Subject(s) - electret , materials science , ceramic , polarization (electrochemistry) , electric field , dehydration , dislocation , charge (physics) , composite material , depolarization , optoelectronics , chemistry , medicine , biochemistry , physics , quantum mechanics , endocrinology
Ceramic hydroxyapatite stores up to 1.2 mC/cm 2 of charge if the electret is poled at high temperature and cooled down in the presence of a field. This extraordinary storage capacity, determined by thermally stimulated depolarization measurements, was obtained at 5 kV and 873 K. The Figure illustrates some of the mechanisms, apart from H + transport, that are involved in charge dislocation: dehydration and O 2– migration at high temperature.